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What is a control cable? And how does it differ from power cables?

Release date:

2022-11-07 14:57

Source:

　　 Control cable This is a PVC-insulated and sheathed control cable, suitable for industrial and mining enterprises, as well as energy and transportation sectors. It is designed for use in control and protection circuits with AC rated voltages up to 450/750V. The control cable can be installed in tunnels or cable trenches, offering excellent moisture-proof, corrosion-resistant, and damage-prevention features. Control cables are used to directly transmit electrical energy from distribution points in the power system to the power supply connections of various electrical equipment and appliances. In contrast, power cables are specifically engineered for transmitting and distributing high-power electricity along the main lines of the power system. While control cables primarily operate at 450/750V, power cables typically have rated voltages of 0.6/1kV and higher. Additionally, power cables feature thicker insulation and sheathing compared to control cables when manufactured in the same specifications.

　　Performance characteristics of control cables: 1. DC Resistance: For 0.5mm copper wire, ≤95 Ω/km; for 0.4mm copper wire, ≤148 Ω/km. 2. Insulation Electrical Strength: Shielded—3 kV for 1 minute; between conductors—1 kV for 1 minute. 3. Insulation Resistance: With each core grounded relative to the others, the control cable must exceed 10,000 MΩ·km, while the HYAT cable must surpass 3,000 MΩ·km. 4. Operating Capacitance: Average of 522 nF/km. 5. Far-End Crosstalk Attenuation: For specified pairs, the average power at 150 kHz exceeds 69 dB/km.

　　The differences between control cables and power cables are as follows: (1) Control cables are classified as electrical equipment cables, whereas power cables belong to two of the five major categories of cables. (2) The standard for power cables is GB12706, while the standard for control cables is 9330. (3) The insulation cores of control cables are typically colored black and white, whereas low-voltage power cables usually feature distinct color-coded designs. (4) The cross-sectional area of control cables generally does not exceed 10 square millimeters, while power cables usually have larger cross-sections, primarily used for power transmission. In contrast, control cables are designed for transmitting control signals and often come with a much higher number of cores—sometimes even customized according to specific user requirements.


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